[GitHub] jpds opened a new pull request #3774: [AIRFLOW-2920] Added downward API metadata to Kubernetes pods

[GitBox <gi...@apache.org>]

jpds opened a new pull request #3774: [AIRFLOW-2920] Added downward API metadata to Kubernetes pods
URL: https://github.com/apache/incubator-airflow/pull/3774
 
 
   ### Jira
   
   - [X] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-2920
   
   ### Description
   
   This adds https://github.com/kubernetes/kubernetes/blob/release-1.0/docs/user-guide/downward-api.md metadata to pods spun up by the Kubernetes executor. This allows one to then dynamically specify a namespace in the DAG task definition with:
   
   ```
   task1 = KubernetesPodOperator(
           namespace=os.getenv('POD_NAMESPACE'),
           ...
   ```
   
   Thus allowing multiple Kubernetes deployments to use the same Docker image.
   
   ### Tests
   
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   There does not appear to be tests for the manifest the Kubernetes executor generates.
   
   ### Commits
   
   - [X] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
   
   ### Documentation
   
   - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
   
   ### Code Quality
   
   - [ ] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
   
   @dimberman 

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